ASTM D2260-02
(Guide)Standard Tables of Conversion Factors and Equivalent Yarn Numbers Measured in Various Numbering Systems
Standard Tables of Conversion Factors and Equivalent Yarn Numbers Measured in Various Numbering Systems
SCOPE
1.1 These tables include (1) a series of conversion factors required to convert the number of a yarn measured in a specific system to the equivalent number measured in various other systems (see Table 1), and (2) specific equivalent numbers for yarns measured in various systems (see Table 2).
1.2 The content is basically consistent with recommendations of the International Organization for Standardization (ISO) Standard 2947.
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Standards Content (Sample)
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Designation: D 2260 – 02
Standard Tables of
Conversion Factors and Equivalent Yarn Numbers Measured
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in Various Numbering Systems
This standard is issued under the fixed designation D 2260; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.1 American grain count—a direct yarn numbering sys-
tem for expressing linear density, equal to the mass in grains
1.1 These tables include (1) a series of conversion factors
per 120 yd of sliver or roving.
required to convert the number of a yarn measured in a specific
3.1.2 cotton count, n—an indirect yarn numbering system
system to the equivalent number measured in various other
generally used in the cotton system equal to the number of
systems (see Table 1), and (2) specific equivalent numbers for
840–yd lengths of yarn per pound.
yarns measured in various systems (see Table 2).
3.1.3 cut, n—in asbestos and glass yarns, the number of
1.2 The content is basically consistent with recommenda-
100-yd lengths of yarn per pound; an indirect yarn numbering
tions of the International Organization for Standardization
system.
(ISO) Standard 2947.
3.1.4 cut, n—in wool yarns, the number of 300-yd lengths
2. Referenced Documents of yarn per pound; an indirect yarn numbering system.
3.1.5 denier, n—the unit of linear density, equal to the mass
2.1 ASTM Standards:
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in grams of 9000 m of fiber, yarn, or other textile strand that is
D 123 Terminology Relating to Textiles
used in a direct yarn numbering system. (See also linear
D 861 Practice for Use of the Tex System to Designate
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density).
Linear Density of Fibers, Yarn Intermediates, and Yarns
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3.1.6 direct yarn numbering system, n—a system that ex-
D 3888 Terminology Related to Open-End Spinning
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presses the linear density of yarn in mass per unit length.
D 3990 Terminology Relating to Fabric Defects
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3.1.6.1 Discussion—The preferred units of measurements
D 4849 Terminology Relating to Fibers and Yarns
for the direct yarn measuring system are grams and meters. Tex
SI 10 Standard for Use of the International System of Units
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(weight in grams for 1000 metres) and Denier (weight in grams
(SI): The Modern Metric System
for 9000 metres) are recommended to show linear density in
2.2 ISO Standard:
the direct numbering system. These can be calculated by
ISO 2947, Textiles–Integrated Conversion Table for Replac-
dividing the mass of a yarn by its length. Conversion factors to
ing Traditional Yarn Numbers by Rounded Numbers in the
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convert between direct and indirect numbering systems can be
Tex System
found in Standard Tables D 2260. D 1059, D 1907, D 2260
2.3 NIST Standard:
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3.1.7 grain, n—in yarn spinning,a direct yarn numbering
NBS–M–121–January, 1936
system sometimes used for expressing linear density in which
3. Terminology
the yarn number is equal to the mass in grains of 120 yd of
sliver, top, or roving.
3.1 Definitions:
3.1.8 grain, n—in measuring mass, 1/7000 lb avoirdupois.
3.1.9 grex, n—an obsolete direct numbering system for fiber
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These tables are under the jurisdiction of ASTM Committee D13 on Textiles
yarn or other textile strand equal to the the mass in grams per
and are the direct responsibility of Subcommittee D13.58 on Yarn and Fiber Test
10 000 m.
Methods.
3.1.10 indirect yarn numbering system, n—a system that
Current edition approved Nov. 10, 2002. Published January 2003. Originally
approved in 1964. Last previous edition approved in 2001 as D2260 – 01. expresses the linear density of yarn in length per unit mass.
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Annual Book of ASTM Standards, Vol 07.01.
3.1.10.1 Discussion—The preferred units of measurements
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Excerpts from SI 10, Standard for Use of the International System of Units (SI):
for the indirect yarn measuring system are yards and pounds.
The Modern Metric Syste, can be found in the Annual Book of ASTM Standards,
Cotton count (number of 840 yard lengths per pound), worsted
Vols 07.01 and 07.02. The standard is available as a separate publication and appears
in its entirety in Vol 14.02.
count (number of 560 yard lengths per pound), metric count
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American National Standards Institute, 11 West 42nd Street, 13th Floor, New
(number of 1000 metre lengths per kilogram), woolen run
York, NY 10036.
5 (number of 1600 yard lengths per pound) and number of yards
Available from National Institute of Standards and Technology, Gaithersburg,
per pound are commonly used in the indirect numbering
MD 20899.
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